The Meprolight 227703101 is a combat-tested, self-illuminated night sight that comprehensively enhances your ability to precisely strike stationary or moving targets under dim light conditions. This improvement significantly boosts your success rate. The TRU-DOT adjustable models come with a refined handgun sighting system for faster instinctive aiming, eliminating the need for switching between day and night usage.Regardless of the time of day, the shooter\'s aiming reference is provided by three solid, identical dots. These dots maintain consistent visibility and positioning under all lighting scenarios. The Meprolight\'s Self-Illuminated night sights are designed to replace the standard weapon sights and can be easily installed with minimal modifications. The dimensions of the sights are as follow: Front Sight Length: 0.13\". Front Sight Width: 0.13\". Rear Sight Length: 0.23\". Rear Sight Width: 0.61\". Rear Sight Height: 0.36\".